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Been there!! I just cut the sensor wires and soldered in extensions. I used heat-shrink tubing, and made it all look pretty. Also did that on my wife's Cavalier when I had to replace the O2 sensor. The Universal Replacement sensor required that I cut off the old connector, and use this funky connector thing to splice the old connector to the new sensor. I said "screw that" and soldered the wires. Looks much cleaner, and works just fine!!!`
OK, did I use the wrong word "extension"??? Let me rewrite that as "I just cut the sensor wires and soldered in some longer pieces of wire between the sensor and the connector.".
Yes, that simple. I've got a 98 Camaro SS that's been running for 6 years on o2 sensors I extended by soldering in longer wires. As I mentioned, I just did this a month ago to my wife's Cavalier, rather that use some funky wire connector thing that came in the O2 sensor kit.